RESORCINOLPHTHALEIN
\ɹɪzˈɔːsɪnˌɒlfθe͡ɪlˌiːn], \ɹɪzˈɔːsɪnˌɒlfθeɪlˌiːn], \ɹ_ɪ_z_ˈɔː_s_ɪ_n_ˌɒ_l_f_θ_eɪ_l_ˌiː_n]\
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a yellow dye that is visible even when highly diluted; used as an absorption indicator when silver nitrate solution is added to sodium chloride in order to precipitate silver chloride (turns pink when no chloride ions are left in solution and negative fluorescein ions are then absorbed)
By Princeton University
